JP4047982B2 - Exhaust pipe support device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an exhaust pipe support device that is used to suspend and support an exhaust pipe connected to a vibration generating source such as a prime mover from a supported body such as a vehicle body.
[0002]
[Prior art]
Conventionally, as this kind of exhaust pipe support device, a device provided with a metal bracket is known (for example, see Japanese Patent Publication No. 2-49934). In this structure, a metal bracket formed in a U-shape and a rubber elastic body connecting portion arranged so as to span the two vertical wall portions of the U-shaped bracket, the bracket is bolted The support member from the exhaust pipe is inserted into the mounting hole formed through the connecting portion while being fixed directly to the vehicle body as the supported body.
[0003]
Further, as an exhaust pipe support device different from the above, an exhaust pipe support device formed by integral molding of a rubber elastic body is known (for example, see Japanese Utility Model Laid-Open No. 4-84711). In this case, as shown in FIG. 8, a first mounting portion 11 having a first mounting hole 2a which is disposed on the upper end side and into which a support member from the vehicle body is inserted, and is disposed on the lower end side from the exhaust pipe. The second mounting portion 12 having the second mounting hole 2b into which the support member is inserted is connected to each other by a pair of main spring portions 13 and 13.
[0004]
[Problems to be solved by the invention]
However, in the exhaust pipe support device described in Japanese Utility Model Laid-Open No. 4-84711, the load input in the left-right direction acts as the bending of the main spring portions 13, 13, so the spring constant in the left-right direction is small. It becomes a thing. As a result, the exhaust pipe swings greatly in the left-right direction. For example, when the exhaust pipe is disposed in a tunnel recessed along the exhaust body along the exhaust pipe, the exhaust pipe There is an inconvenience that it interferes with the walls of the tunnel close to the left and right.
[0005]
On the other hand, in the exhaust pipe support device described in the above Japanese Patent Publication No. 2-49934, the load input in the left-right direction acts as compression of the connecting portion, and both ends of the exhaust pipe support device are regulated by metal brackets. Although the lateral deflection is restricted to a predetermined amount, since the bracket is directly attached to the vehicle body with a bolt, there is an inconvenience that the attaching operation itself becomes difficult. In addition, since it is necessary to manufacture a metal bracket, the number of processes increases correspondingly when manufacturing the exhaust pipe support device. As a result, there is a disadvantage that the manufacturing cost increases.
[0006]
The present invention has been made in view of such circumstances, and an object of the present invention is to provide an exhaust pipe support device that supports an exhaust pipe suspended from a supported body without causing an increase in manufacturing cost. The purpose is to effectively regulate the displacement of the exhaust pipe in the left-right direction.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, the present inventor considered that a rubber elastic body has a higher spring constant when a load in the compression direction is applied than when a load in the bending direction is applied. The load input portions from either one of the support members of the exhaust pipe and the exhaust pipe are arranged at two places separated from each other in the vertical direction, and the load input positions from the other support member are arranged between the two load input portions. Accordingly, the present invention has been completed by paying attention to the fact that a load in the left-right direction can be applied as a load in the compression direction.
[0008]
Specifically, the present invention is directed to an exhaust pipe support device that suspends and supports an exhaust pipe with respect to a supported body, in which a first attachment portion disposed on an upper end side, and a lower end A second mounting portion disposed on the side, a pair of main spring portions that are spanned between the first mounting portion and the second mounting portion and connect the first and second mounting portions to each other; and A third attachment portion disposed between the first attachment portion and the second attachment portion and between the pair of main spring portions; from the third attachment portion to the first attachment portion; A pair of connecting spring portions extending to both sides in the left-right direction perpendicular to the up-down direction connecting the second mounting portion and connected to the pair of main spring portions are integrally formed by a rubber elastic body, and the first and First and second attachments in which a support member extending from one of the exhaust pipe and the supported body is inserted into the second attachment portion. Forming a, in the third mounting portion is configured to the specific matters to form a third mounting hole supporting member extending from the other of the exhaust pipe and the supported body is inserted. Here, the exhaust pipe is connected to a prime mover as a vibration source to transmit vibration from the prime mover, and includes a silencer communicated with the exhaust pipe main body in addition to the exhaust pipe main body. .
[0009]
In this case, when a load in the left-right direction is input to the exhaust pipe, the load is input so as to swing the third attachment portion in the left-right direction when the first and second mounting portions are fixed. It will be. The input load in the left-right direction acts on the connecting spring portion in the compression direction. For this reason, the spring constant in the left-right direction is relatively high. As a result, the displacement of the exhaust pipe in the left-right direction is restricted, and interference between the exhaust pipe and the supported body is prevented.
[0010]
On the other hand, even when a vertical load is input, the main spring portion acts as a compression based on the vertical load because the main spring portion and the connecting spring portion are connected to each other. It becomes one of the upper part and the lower part of the main spring part. For this reason, the substantial natural frequency of the main spring portion tends to be higher than when a compression force is applied to the entire length of the conventional main spring portion. As a result, the surge frequency (resonance frequency) shifts to the high frequency side.
[0011]
In such an exhaust pipe support device, the support member from the supported body side is inserted into the first and second mounting holes, while the support member from the exhaust pipe is inserted into the third mounting hole. On the contrary, the support member from the exhaust pipe side is inserted into the first and second mounting holes, while the support member from the supported body is inserted into the third mounting hole. Good. In any of the above cases, since the relative displacement between the support member from the exhaust pipe and the support member from the supported body acts on the exhaust pipe support device, both of the above actions can be obtained. For example, when a support member from a supported body is inserted into the first and second mounting portions, the support member from the supported body is disposed to extend horizontally from the lateral direction with respect to the exhaust pipe. However, since the upper end and the lower end of the exhaust pipe support device are fixed, the exhaust pipe support device itself is stably disposed. For this reason, it becomes possible to stably support the exhaust pipe, and when the support member from the exhaust pipe and the support member from the supported body are arranged above and below the exhaust pipe support device, However, the degree of freedom regarding the positional relationship between the exhaust pipe and the supported body in the arrangement of the exhaust pipe is improved.
[0012]
Furthermore, since the exhaust pipe support device can be formed by integral molding of a rubber elastic body, the manufacture can be facilitated and the manufacturing cost can be reduced.
[0013]
In addition, when the exhaust pipe support device is attached, only the support members are inserted into the attachment holes, so that the attachment work can be facilitated.
[0014]
In the above invention, the pair of connecting spring portions may be formed such that the thickness in the front-rear direction perpendicular to the vertical direction and the left-right direction is thicker than the first and second mounting portions. . In this case, by increasing the thickness of the connecting spring portion, only the spring constant in the left-right direction is increased without changing the spring constant in the up-down direction based on the main spring portion, and the ratio of the spring constant in the up-down direction and the left-right direction is increased. The change adjustment can be easily realized.
[0015]
Furthermore, in the above invention, a space defined by the first and second mounting portions and the pair of main spring portions is formed on each of the upper and lower sides with the third mounting portion and the pair of connecting spring portions interposed therebetween. At least one side in the front-rear direction of the front-rear direction end surface of the three attachment portions and the front-rear direction end surfaces of the first and second attachment portions may be connected to each other by a thin portion covering the space. Even in this case, by providing the thin portion, only the spring constant in the left-right direction is increased without changing the spring constant in the up-down direction based on the main spring portion, and the ratio of the spring constant in the up-down direction and the left-right direction is changed, Ratio change adjustment can be realized more easily.
[0016]
【The invention's effect】
As explained above, according to the exhaust pipe support device of the invention of claim 1, the spring constant in the left-right direction can be made relatively high, and as a result, the displacement of the exhaust pipe in the left-right direction is restricted, Interference between the exhaust pipe and the supported body can be prevented. In the case of load input in the vertical direction, the surge frequency (resonance frequency) can be shifted to a high frequency.
[0017]
In addition, since the exhaust pipe support device can be formed by integral molding of a rubber elastic body, manufacturing can be facilitated and manufacturing cost can be reduced.
[0018]
Furthermore, if there are two supporting members from the supported body, the degree of freedom in disposing the exhaust pipe can be improved.
[0019]
In addition, when the exhaust pipe support device is attached, only the support members are inserted into the attachment holes, so that the attachment work can be facilitated.
[0020]
According to the invention described in claim 2, in addition to the effect of the invention described in claim 1, change adjustment of the ratio between the spring constant in the vertical direction and the spring constant in the horizontal direction can be easily realized.
[0021]
According to the third aspect of the invention, in addition to the effect of the second aspect of the invention, it is possible to more easily realize the change adjustment of the ratio between the vertical spring constant and the horizontal spring constant. .
[0022]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0023]
1 to 3 show an exhaust pipe support device according to an embodiment of the present invention. Reference numeral 1 denotes a uniform rubber elastic body, which has a constant thickness and is formed in a substantially oval shape or a substantially oval shape that is long in the vertical direction It is an exhaust pipe support device. The exhaust pipe support device 1 includes a first attachment portion 11 having a first attachment hole 2a formed at the upper end portion thereof, and a second attachment portion 12 having a second attachment hole 2b formed at a lower end portion thereof. Yes. A pair of main spring portions 13 and 13 are formed that are curved outward in the left-right direction so as to connect the first and second attachment portions 11 and 12 to each other.
[0024]
A third mounting portion 14 having a third mounting hole 2c formed between the pair of main spring portions 13 and 13 at a substantially central position in the vertical direction of the first and second mounting portions 11 and 12. Is arranged. And the connection spring parts 15 and 15 extended from this 3rd attachment part 14 to the both sides of the left-right direction and connected with the inner wall of the said main spring parts 13 and 13 are arrange | positioned.
[0025]
The first space 16a and the second space between the first mounting portion 11 and the third mounting portion 14 and between the second mounting portion 12 and the third mounting portion 14 penetrate in the thickness direction. 16b.
[0026]
And the 1st and 2nd support members 3a and 3b from the vehicle body 3 as a to-be-supported body are inserted in the first and second mounting holes 2a and 2b, and from the exhaust pipe 4 to the third mounting hole 2c. The support member 4a is inserted.
[0027]
The first support member 3a is connected to the vehicle body 3, while the second support member 3b is joined to the first support member 3a by welding.
[0028]
Further, the lower end of the first mounting portion 11 is a stopper portion 11a protruding downward, and the upper end of the second mounting portion 12 is also a stopper portion 12a protruding upward. The upper and lower ends of the third mounting portion are stopper portions 14a and 14b that protrude upward and downward, and the stopper portions 11a, 12a, 14a, and 14b provided in the first to third mounting portions 11-13. Thus, when a vertical load is input to the exhaust pipe support device 1, the stopper portions 11a, 12a, 14a, and 14b come into contact with each other, and the vertical displacement is regulated to a predetermined amount. It has become.
[0029]
Next, the operation and effect of the above embodiment will be described.
[0030]
The first and second support members 3a and 3b from the vehicle body 3 are inserted into the first and second attachment holes 2a and 2b, and the support member 4a from the exhaust pipe 4 is inserted into the third attachment hole 2c. When the exhaust pipe 4 vibrates in the left-right direction, the third mounting portion 14 swings in the left-right direction when the first and second mounting portions 11, 12 are fixed. For this reason, the load in the left-right direction acts on the connecting spring portions 15, 15 in the compression direction. For this reason, the spring constant in the left-right direction can be made relatively high. As a result, the displacement of the exhaust pipe 4 in the left-right direction is restricted, and for example, interference between the exhaust pipe 4 and the supported body can be prevented.
[0031]
On the other hand, when a vertical load is input,
The main spring portions 13 and 13 that act as compression on the basis of the load in the vertical direction are the main spring portions sandwiching a connecting position where the main spring portions 13 and 13 and the connecting spring portions 15 and 15 are connected to each other. 13 and 13 become one of the upper part and the lower part. For this reason, the substantial natural frequency of the main spring portions 13 and 13 tends to be higher than when a compression force is applied to the entire length of the conventional main spring portion. As a result, the surge frequency (resonance frequency) can be shifted to the high frequency side.
[0032]
In addition, since the exhaust pipe support device 1 can be formed by integral molding of a rubber elastic body, the manufacturing can be facilitated and the manufacturing cost can be reduced.
[0033]
In addition, when the exhaust pipe support device 1 is attached, the support members 3a, 3b, and 4a are only inserted into the first to third attachment holes 2a to 2c. It becomes possible to plan.
[0034]
<Other embodiments>
In addition, this invention is not limited to the said embodiment, Various other embodiments are included. That is, in the above embodiment, the support members 3a and 3b from the vehicle body 3 are inserted into the first and second mounting holes 2a and 2b, while the support member 4a from the exhaust pipe 4 is inserted into the third mounting hole 2c. In contrast, for example, one support member from the vehicle body 3 and two support members from the exhaust pipe 4 are provided in the first and second mounting holes 2a and 2b. On the other hand, the support member from the exhaust pipe 4 may be inserted, while the support member from the vehicle body 3 may be inserted into the third mounting hole 2c. Even in this case, since the relative displacement between the support member from the exhaust pipe 4 and the support member from the vehicle body 3 acts on the exhaust pipe support device 1, the same effect as the above embodiment is obtained. be able to.
[0035]
Further, in the above embodiment, the support members 3a and 3b from the vehicle body 3 are disposed so as to extend vertically from the upper side of the exhaust pipe support device 1. However, the present invention is not limited to this. You may arrange | position so that it may extend horizontally from either the right or left side with respect to an exhaust pipe support apparatus. Even in this case, since there are two support members 3a and 3b, the upper and lower ends of the exhaust pipe support device are fixed, and the exhaust pipe support device 1 itself is stably disposed. Become so. Accordingly, the exhaust pipe 4 can be stably supported, and the degree of freedom regarding the positional relationship between the vehicle body 3 and the exhaust pipe 4 can be improved in the arrangement of the exhaust pipe 4. Become.
[0036]
In addition, in the above embodiment, the exhaust pipe support device 1 having a constant thickness is used. However, the present invention is not limited to this, and for example, as shown in FIGS. The thicknesses of the third mounting portion 140 and the connecting spring portions 150 and 150 are made thicker than the thickness of the two mounting portions 110 and 120, and the front and rear end surfaces of the third mounting portion 140 and the first and second mounting portions 110 are increased. 120 may be connected to each other by thin portions 160c and 160d covering the first and second cavities 160a and 160b. In this case, by increasing the thickness of the connecting spring portions 150, 150, only the spring constant in the left-right direction is increased without changing the spring constant in the up-down direction based on the main spring portions 130, 130. The change adjustment of the ratio of the spring constant to the direction can be easily realized. Also, by providing the thin portions 160c and 160d, only the spring constant in the left-right direction is increased, the ratio of the spring constant in the up-down direction and the left-right direction is changed, and the change adjustment of the ratio can be realized more easily. Will be able to. In addition, by providing the thin portions 160c and 160d, it is possible to increase the spring constant in the direction (twisting direction) in which the third mounting portion 140 rotates about the axis extending in the left-right direction. For this reason, when the support member from the exhaust pipe is inserted into the third attachment hole 2c, the exhaust pipe can be reliably held in a horizontal state.
[0037]
【Example】
FIG. 7 shows the test results when vibration is actually applied to the device of the present embodiment shown in FIG. 2 (solid line) and the conventional device shown in FIG. 8 (broken line). FIG. 7 shows the change of the dynamic spring constant with respect to the frequency. In the conventional example, the peak frequency (surge frequency) of the dynamic spring constant occurs before 500 Hz. In the present embodiment, the surge frequency is 800 Hz. That's it. That is, by configuring the exhaust pipe support device 1 as in this embodiment, the main spring portions 13 and 13 are connected to the main spring portions 13 and 13 and the connecting spring portions 15 and 15 are connected. Is separated into an upper portion and a lower portion, so that the natural frequency of the main spring portions 13 and 13 can be dispersed, and as a result, the surge frequency is set to the high frequency side. It is thought that you can. Further, as the surge frequency shifts to the high frequency side, the dynamic spring constant can be reduced as shown by the dashed line hatching in FIG.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an embodiment of the present invention.
FIG. 2 is a front view of the exhaust pipe support device.
FIG. 3 is an explanatory cross-sectional view showing the AA cross section of FIG. 2;
4 is a view corresponding to FIG. 2 of an exhaust pipe support device according to another embodiment.
5 is a cross-sectional view showing a BB cross section of FIG. 4. FIG.
6 is a cross-sectional view taken along the line CC of FIG. 4;
FIG. 7 is a relationship diagram between a vibration frequency and a dynamic spring constant in the present embodiment and a comparative example.
FIG. 8 is a view corresponding to FIG. 2 showing a conventional exhaust pipe support device.
[Explanation of symbols]
1 Exhaust pipe support device 3 Car body (supported body)
4 Exhaust pipe 11 First mounting portion 12 Second mounting portion 13, 13 Main spring portion 14 Third mounting portion 15, 15 Connecting spring portion 2a First mounting hole 2b Second mounting hole 2c Third mounting hole 3a, 3b Support member (Body)
4a Support member (exhaust pipe)
16a, 160a 1st space 16b, 160b 2nd space 160c, 160d Thin part

Claims (3)

In an exhaust pipe support device that supports an exhaust pipe suspended from a supported body,
A first mounting portion disposed on the upper end side;
A second mounting portion disposed on the lower end side;
A pair of main spring portions that are spanned between the first attachment portion and the second attachment portion and connect the first and second attachment portions to each other;
A third attachment portion disposed between the first attachment portion and the second attachment portion and disposed between the pair of main spring portions;
A pair of connecting spring portions extending from the third mounting portion to both sides in the left-right direction perpendicular to the vertical direction connecting the first mounting portion and the second mounting portion and connected to the pair of main spring portions are rubber. Integrally formed by an elastic body,
The first and second attachment portions are formed with first and second attachment holes into which a support member extending from one of the exhaust pipe and the supported body is inserted,
The exhaust pipe support device, wherein a third attachment hole into which a support member extending from the other of the exhaust pipe and the supported body is inserted is formed in the third attachment part. In claim 1,
The exhaust pipe support characterized in that the pair of connecting spring portions are formed such that the thickness in the front-rear direction perpendicular to the vertical direction and the left-right direction is thicker than the first and second mounting portions. apparatus. In claim 2,
A space defined by the first and second mounting portions and the pair of main spring portions is formed on each of the upper and lower sides across the third mounting portion and the pair of connecting spring portions,
Exhaust gas characterized in that at least one side in the front-rear direction of the front-rear direction end surface of the third attachment portion and each front-rear direction end surface of the first and second attachment portions is connected to each other by a thin portion covering the space. Tube support device.

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